import pygame.font

class Button():
    def __init__(self, ai_settings, screen, msg):
       """初始化按钮的属性"""
       self.screen = screen
       self.screen_rect = screen.get_rect()

       #设置按钮的尺寸和其他属性
       self.width, self.height = 200, 50
       self.button_color = (0, 255, 0)
       self.text_color = (255, 255, 255)
       self.font = pygame.font.SysFont(None, 48)

       #创建按钮的rect对象，并将其居中
       self.rect = pygame.Rect(0, 0, self.width, self.height)
       self.rect.center = self.screen_rect.center

       #按钮的标签只需要创建一次
       self.prep_msg(msg)

    def prep_msg(self, msg):
           """将msg渲染为图像，并将其在按钮上居中"""
           self.msg_image = self.font.render(msg, True, self.text_color, self.button_color)
           self.msg_image_rect = self.msg_image.get_rect()
           self.msg_image_rect.center = self.rect.center

    def draw_button(self):
           #绘制一个用颜色填充的按钮，再绘制文本
           self.screen.fill(self.button_color, self.rect)
           self.screen.blit(self.msg_image, self.msg_image_rect)
           
